Major refactoring

[dheid]

Closes #65

[github-actions]

Overall Project	96.92% -3.08%	🍏
Files changed	96.74%	🍏

File	Coverage
CustomVariables.java	100%	🍏
EcommerceItem.java	100%	🍏
AcceptLanguage.java	100%	🍏
Hex.java	100%	🍏
EcommerceItems.java	100%	🍏
CustomVariable.java	100%	🍏
UniqueId.java	100%	🍏
DeviceResolution.java	100%	🍏
RandomValue.java	100%	🍏
Country.java	100%	🍏
CustomVariable.java	100%	🍏
EcommerceItem.java	100%	🍏
PiwikDate.java	100%	🍏
PiwikLocale.java	100%	🍏
PiwikTracker.java	100%	🍏
PiwikRequest.java	100%	🍏
MatomoDate.java	100%	🍏
EcommerceItem.java	100%	🍏
MatomoRequest.java	100%	🍏
RequestValidator.java	100%	🍏
ProxyAuthenticator.java	100%	🍏
InvalidUrlException.java	100%	🍏
MatomoException.java	100%	🍏
AuthToken.java	100%	🍏
DaemonThreadFactory.java	100%	🍏
TrackingParameterMethod.java	100%	🍏
MatomoLocale.java	100%	🍏
TrackerConfiguration.java	100%	🍏
VisitorId.java	94.96% -5.04%	🍏
MatomoTracker.java	94.81% -5.19%	🍏
Sender.java	93.93% -6.07%	🍏
QueryCreator.java	93.84% -6.16%	🍏
CustomVariable.java	47.37% -52.63%	❌